Multiple-arc lamp.



M. j. WOHL.

MULTIPLE ARC LAMP.

APPLICATION FILED APR. Is. I9Ie.

Patented July 31, 1917.

2 SHEETS-SHEET i.

M. J. WOHL.

MULTIPLE ARC LAMP.

APPLICATION FILED APR. I8. I9I6.

Patented t11113; 31, 191?.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFTQE.

MAURICE J. WOHL, 0F BROOKLYN, NEW YORK, ASSIGNOR TO M. J. WOHL ANDGQ211- PANY, OF BROOKLYN, NEW YORK, A COPARTNERSHIP COMPOSEI) OF MAURICE3'.

WO1-IL AND MAX MAYER.

MULTIPLE-ARC LAMP.

Application filed April 18, 1916.

T 0 all whom t may concern.'

Be it known that MAURICE J. WOHL, a citizen of the United States, andresident of Brooklyn, city of New York, county of Kings, and State ofNew York, has invented certain new and useful Improvements 1nMultiple-Arc Lamps, of which the following is a specification.

This invention relates to electric are lamps and more -especially tomultiple arc lamps and it hasl for an object to provide an improvedconstruction whereby a more uniform relative feed and adjustment of thedifferent carbons may be effected and which will act to eliminate noisesin the lamp. further object is to provide means for preventing thecurrent in one arc from influencing the current in another arc.

These and other objects and details of the invention will be more fullydescribed in the following specification, set forth in the appendedclaims and illustrated in the accompanying drawings forming a part ofthis application and wherein;

Figure 1 is a sectional view through the box inclosing the lamps showingthem from the front.

Fig. 2 is a transverse vertical sectional view through one end of theboX.

Fig'. 3 is a detail view of the buffer for the feed means.

The lamp arrangement shown in the drawings is especially adapted for usewhere a constant light is necessary and where theV operation of the feedshould be noiseless. To produce this result the device is mounted vin aboX 5 of the desiredsize and divided horizontally by the partition6,'the lower compartment 7 containing the l lamps 8, 9, 10 and 11' andbeing painted or coated with a reflecting material to throw the light ofthe lamps out of the opening 1Q.

The upper compartment 13 contains the solenoids 14, dash pots 15 andspring connections of the clutches 16, also guiderods 17 on which playthe'cross bars 18 carryingI the sockets` 19 for the upper carbons 20.The lower carbons 21 are stationary and are suspended in frames 22 bymeans of rods 23 from a platform 24 hung from the partition 6 by means'of bolts 25. The rod 23 also carries a magnetic shield 26 to shieldeach arc from the magnetic effects of the current in theadjacent arc ina set and to prevent the irregular wearing ofthe carbons at their ad-Specicaton of Letters Patent.

Patented July 31, 1317.

Serial No. 91,867.

jacent points. The shield 26 is of thin metal and almost completelypartitions the compartment 7, effectually separating the different arcsbut not interfering with the escape of light through the openings 1Q.

Each solenoid 14 is secured to the inner top wall of the uppercompartment 13 by means of rods 28 which also carry at their lower endsdash pots 16. From the core of the solenoid extends a rod 29 carrying atits lower end the plunger 30 operating in the dash pot 15 and interposedbetween the plunger and the rod 29 are the vertically7 spaced horizontalsprings 31 joined at their outer ends by bolts 32, and fixed upon thelower springs is a cross bar 33, the ends of which carry the rods whichconnect the cross bar withthe clutches 16 to operate the upper carbon atthe proper time. These rods are here shown as composed of separate upperand lower members and 36 joined together by the angular springs 34 whichare secured at opposite ends to the respective members 35 and 36. 71ththe above described arrangement of springs a resilientfconnection iseffected between the solenoid core and the dash pot and furtherresilient connections between the dash pot and clutches. To preventinjury to the springs 34 from too great compression during insertion ofa carbon in place I have shown the adjacent ends of the members 35 and36 as proj ecting' into the space between the springs 34 so as to limitthe compressional movement of the springs by engagement with one,another, the lower member havin an upturned fork 37 in which is receivedthe end of the upper member.

By the arrangement of a single solenoid to control a plurality of arcs Iam enabled to insure of a more even consumption of the carbons andv amore even light from each arc since the lifting force transmitted toeach carbon will be the same, which result can not be secured with anydegree of accuracy by individual solenoids and dash pots for each arc.

The circuit connections are down one lamp and up the companion lamp, theupper carbon of one set of lamps being the negative pole of the currentwhile the adjacent upper carbon is positive, the course of thecurrentvbeing downward and then upward, or vice versa.

The use of one solenoid for each pair of lamps also simplifies theconstruction of the lamp while the resilient connections take up thevibration in the solenoid core when alternating current is used andprevent noise the whole arrangement resulting in a simple and silentdevice. It is obvious that the parts may be otherwise arranged or modiedwithout departing from the essential features above described or fromthe scope of the appended claims.

As will be noted, the construction de- -scribed provides a resilientconnection between the solenoid core and the dash pot and a furtherresilient connection between the dash pot and carbons, which arrangementhas been shown in actual practice to be extremely eficient ineliminating flicker-- yoke midway between the ends of the latter.

2. In a multiple arc lamp, two carbon pairs, a clutch for each pair,longitudinally resilient vertical rods connected one to each clutch attheir lower ends, a resilient yoke consisting of a pair of horizontallyarranged and vertically'spaced flat springs connected together at theirends and a bar.

supported on the lower sprin said bar i core connected to the upperspring midway 'between the ends of the latter and a dash pot connectedto the lower spring midway between the ends of the latter.

3. In an arc lamp, in combination, a solenoid, a pair of carbons aclutch therefor, and a longitudinally resilient rod forming a co1@-nection between the said clutch and the core of the solenoid, said rodcomprising upper and lower members and a pair of springs bentoutwardlybetween their ends connecting said upper and lower members, one of saidmembers presenting at the end adjacent the other rod member' a recessadapted to receive the last mentioned member, for the purpose `setforth. A

4. In an arc lamp, in combination, a solenoid, a pair of carbons, aclutch therefor, and a longitudinally resilient rod forming a connectionbetween the said clutch and the core of the solenoid, said rodcomprising upperI and lower members and a pair of springs bent outwardlybetween their ends connecting said upper and lower members, one of saidrod members presenting at the end adjacent the other rod member a forkinto which the end of the last mentioned rod member projects.

Signed at city, county and State of New York, this 27th day of March,1916.

MAURICE J. WOHL.

